Air-preheating attachment for furnaces



' Oct.29, 1929. CASSAVANT 1,733,862

AIR PREHEATING ATTACHMENT FOR FURNACES Filed Oct. 1. 1928 2 Sheets-Sheet l [NW5 0 o 0 o ofi t'o 00 0 o INVENTOR.

A [b g 5 J Cassavu/n t,

J 2 ATTORNEY.

Oct. 29, 1929. cAss 1,733,862

AIR PREHEATING ATTACHMENT FOR FURNACES 4 7 INVENTOR. MZ&e/'ZJUa5swa/ q in: Z

, ATTORNEY.

Patented Oct. 29, 1929 ALBERT JosErrr o ssAvAET, E WHITE BEAR rAxnivnnnEso A IR-PBE EATING ATTACHMENT FOR 'EuiaNAcEs Application filed October 1, 1928'. Serial No. 309,470.

This inventionrelates to an air preheating attachment for furnaces, and has for its object to provide, in a manner as hereinafter set forth, an attachment of such class for connection with a furnace door to provide for the preheating of'the air supplied through the draft device on the door, whereby the air when discharged into the fire box or chamber will be thoroughly heated to facilitate the 1 combustion of the'fuel. v

Further objects of the invention are to provide, in a manner as hereinafter set forth, an air preheating attachment for the purpose referred to, which'is simple in its construction 1'5 and arrangement, strong, durable, thorough ly efificient in its use, readily installed with respect to the furnace door, and comparative -ly inexpensive to manufacture. V

' WVith the foregoing and other objects in view, the invention consists of the novel construction, combination and arrangement of parts, as hereinafter more specifically described and illustrated in .the accompanying drawings, wherein is'shown an embodiment of the-inventiombutit is to be understood that-changes, variations and modifications can" be resorted to which comewithin the scope of the claims hereunto appended. In the drawings wherein like reference 550 characters denote corresponding parts throughout the several views r Figure 1 is a vertical sectional View illustrating the attachment, in position with respect to the doorof the furnace.

' 3 5 Figure 2 is" a" frontelevation of the attachment. H.

Figure 3 1s a rear elevatlon thereof. Figure 4 is a sectlon on l1ne'4, Flgure 2.

Figure 5 is a section on line 5 5, Figure 2;

Figure 6 is a section on line 66, Figure 1.

Referring to the drawings 'in detail, 1 indicates a furnace door formed withan offset portion 2, provided with draft openings 3 and which open into a chamber 4, having '45 arranged therein a regulating element-5 pivotally supported from the offset portion 2and manually operated. The elements 2 to 5, both inclusive, are shown by way of example to provide a controllable draft device on the door 1. The air supplied to the the air fromthe chamber 4.

openings 3 passes intothe chamber 4 and is discharged into the attachment, to be presently referred to, which is secured against the inner face of the door 1 and projects inwardly therefrom a substantial distance.

An air preheating'attachment, in accordance'with thisinvention, comprises an open front housing consisting of a pairof endwalls 6, 7 a top wall 8, a bottom -9 and a rear wall 10, WlllCll'lS of less height'than the open front of the housing. The rear terminal portion of each of the end walls 'is'of tapered formation, as indicated at 11, 'and'the rear terminal portion of thetop wall 8 extends downwardly, as at 12, andrmerges into the rear Wall 10. The rear terminal portion of V the bottom 9 is extended upwardly at aninclination,-as at 3 and merges into the rear wall 10. V The endwalls 6 and 7 are integral with the top, bottom and rear walls of the housing. The forward end of the'top wall 8 has formed integral therewith'apair of spaced forwardly extending'apertured lugs 14, through which extend-hold fast devices 15 for detachably securing the-top of the attachment to the door 1. The forward end. of the bottom 9 is provided with a pair ofdepending ap'ertured lugs 16, through which extend'hold fast devices 17 for detachably securing-the bottom of the'housing to'the door 1; The hold fast devices '15-and 17 extend through the door 1 andwhen acting to secure the housing in position, the latter arranged to have its forward open end receive s5 Formed integral withthe lower f'aceof the wall 8, forwardly of the portion '12of the latter, and arranged in spaced relation is a pair of depending ribs 18, 19, whichlextend from one end wall to the other. The'rib 18 is positioned rearwardly with respect to the open front of thehousing; Formed integral withthe upper face of the bottom 9, forward- 1y with respect to the portion 13 thereofand arranged in spacedrelation, is a pair of up- '95 wardly projecting ribs 20, 21-, extending from i one end wall to the other. The rib 18 is arranged in superposed alignment with respect to the rib 20, and the ribs 19, and 21 are ar-' ranged in a similar manner. Formed in- 'tegral with the end walls 6, 7, is a pair of superposed, spaced bars 22, 28, the former is arranged below and in alignment with the rib'19 and the latter is arranged above and in alignment with the rib 21.

Positioned, forwardly of and arranged against the ribs 18, 20, is a combined b'afile and partition plate 24, and which is fixedly secured in position by hold fast devices 25 thereof cut away for 1 as indicated at 26 and su o d by tll bars 22, 2 and extendipaltitionand do ctor p a 3., which .ex-

the rear wall o f chamber 30.

extending through the plate andengaging in the ribs 18, 20. The plate 24 has each end a 2portion of i s Width, vto form air outlets,

and said portions 26 and 27 are diagonally disposedwith respect to the plate. The outlets are indicated at 28,29 and permit the air topass from a shallow coldvair receiving c amber- 3Q,;W ch s rmed by the plate 24,

thehousing and the door 1- and into which opens the chamber 4. The plate 24 forms ing from the inner face of the plate 24 to the inner face of the rear wall is a horiz nt lly d spose r i i 3 which a so abuts the inner faces of the end walls 6 and 17, The partition-31 1s secured to the plate 2 at h long t din l m an .t.1.1e1at er,

by theholdfast devices 32; Seated on the P itio 1 a sccurc tothe rib 1- nd ba .22, I? wardl her of, is a c mbined tQHdSfIQIIl't-he end wall 7 and terminates at a po nt remov d rom the end wall 6 to pr vide an air ou e -pa sage 34. H ld fas dev ces re empl yed for sec ri g t e pl te 3 to ithoib-19 andba 22. The plate 33, n connectio w th the pa it n 31, plate 24 and housing, formsan airheating compartment-:36.- Seated on the bottom 9 r sec red the rib 21 and bar 23, fora d y thereof, as well as abutting against 7 the lower face of the Pa tition 31 is a combined partition and deflecting plate .38, which egrteudsfrom theend wall 6 and terminates at apoint removed "from the end W ll 7 toprovide an air outlet passage Hold fast devices ,40. are employed for securing the plate 361:0 the rib, 21 and bar 23. Theplate 36, in connection with the partitronBLplate 24 and housing, provides an air heating compartment 41 arranged below the compartment .36. The :partition31, rearwardly-of-the plates .33 and in connection Wlth theselatter and the housing, forms a pair ofsuperposed air heating compartments [42,- 43.; The upper part ofthe rear wall 10 is provided with a ,series'fof ports 44 consti- V tuting'discharge outlets for the air from the compartment 42 and the lower part of the I rear wall .10 isprovid'edwith a series of ports 45 constituting discharge outlets for the air from the compartment 43.

o5 chamber 30 and an inlet for the compartment The passage 28 provides an outlet for the 36. The passage 29 provides an outlet for the chamber 30 and an inlet for the compartment 41. The passage 34 provides an outlet for the compartment 36 and an inlet for the compartment 42. The passage 39 provides an outlet for the compartment 41 and an inlet for the chamber 43. As the air supplied to the chamber 30 is deflected into the compartments 36and 41 and from said compartments deflected into the compartments 42, 43 ,'the air is thoroughly heated, due

to. the number of heat radiating surfaces formed by the walls of the several compart- -m .ents. The air enters acompartment 36 or 41 at one end and is discharged therefrom at the other end. The air enters compartments 42, .43 at opposite endswith respect thereto and is'discharged from such com.-

Partmentsin jet-like form into the fire box v o chambe "The attachment providesfora thorough preheating ofthe air before it is discharged into the fire box or chamber, and it is thought the many advantages of an air preheating attachment, constructed in accordance with hi inven io can readily r o and although the, preferred embodiment of the invention is as illustrated and described, yet it is to be understood that changes in the details .ofconstruetion can be had which will fall within claimed.

What I claimis "1. An air preheating attachment for furnaces comprisingv a coldv airreceiving chamber meluding a rear wall provided at each end with an an outlet passage, said passages the scope of the invention as diagonally disposed with respect to said wall,

the said other pair of compartments and each receiving air-atnthe front thereof from the outlet passage of oneof such-compartments,

and each of thecom'partments ofthe lastmen tioned pair having a series of dis'charge outlets at the rear thereof. r i

2. An air: preheating attachment for furnaces comprising an open front housing, a

vertically disposed combined partition and a cold air receiving chamberysaid plate having a portion of each end thereof cut away to provide an outlet passage, saidpassages diagonally disposed with respect to said" plate, means arrangedwithin said housing and in connection withthe latter and said plate to provide two pairs of superposed air heating compartments, one pair arranged rearwardly of the other an clwith each oftho compartments of the forw-ard pair receiving deflector plate secured therein and providing 5120 air at one end of its front through one of said passages and discharging air at one end of ts rear into a compartment of said rear pair, and said housing provided at its rear with discharge ports for each of the compartments of the rear pair of compartments.

3. An air preheating attachment for furnacescomprising two pair of superposed air heating compartments, one pair arranged forwardly of the other and each communicating at one end with one of the compartments of the rear pair, the upper compartment of the forward pair communicating with the upper compartment of the rear pair at an end opposite that end with which the lower compartment of the forward pair communicates with the lower compartment of the rear pair, a cold air receiving chamber common to the compartments of the forward pair and communicating at its ends with such compartments, the point of communication between the chamber and the upper compartment of the forward pair being above and at an opposite end with the point of communication of said chamber with the lower com partment of the forward pair, and means to provide discharge ports for each of the compartments of the rear pair at the rear thereof.

4. An air preheating attachment for furnaces comprising two pair of superposed air heating compartments, one pair arranged forwardly of the other and each communieating at one end with one of the compartments of the rear pair, the upper compartment of the forward at an end opposite that end with which the lower compartment of the forward pair communicates with the lower compartment of the rear pair, a cold air receiving chamber common to the compartments of the forward pair and communicating at its ends with such compartments, the point of communication between the chamber and the upper compartment of the forward pair being above and at an opposite end with the point of communication of said chamber with the lower compartment of the forward pair, and means to provide discharge ports for each of the compartments of the rear pair at the rear thereof, the rear portion of each of the compartments of the rear pair of compartments being ofless hei ht than the forward portion thereof.

nttestimony whereof, I affix my signature ere 0.

ALBERT JOSEPH CASSAVANT.

pair communicating with the upper compartment of the rear pair 7 

